Ruby on Rails vs JavaScript: Compare the Right Things

Ruby on Rails vs JavaScript compares a web framework with a programming language. Rails uses Ruby to organise application work on the server. JavaScript can run in a browser and, through runtimes such as Node.js, on a server. A Rails application can also use JavaScript, so these are not mutually exclusive choices.

To make the decision useful, name the job you need done. Are you learning to build web pages? Choosing a backend for a new product? Improving an existing interface? Each question leads to a different comparison. Choosing between two names without that context is an easy way to buy unnecessary work.

Ruby on Rails vs JavaScript: language and framework

Rails includes conventions and tools for processing incoming HTTP requests, organizing your application source code and working with data. JavaScript is a language that allows you to implement behavior. It does not define a specific layer for database access, routing or deployment.

The MDN JavaScript tutorial provides details about the language and its environment. The Ruby versus Ruby on Rails tutorial outlines why the language and framework are considered to be separate concepts.

If you are asking about a server-based comparison, please name the full JavaScript stack including Node.js, the selected web framework and the method used to persist your data. Once you have identified the full stack of technologies to be compared, then it will allow your team to know exactly what to install, evaluate and deploy.

What the browser does

The browser shows the content of a page and processes interaction. HTML defines the basic structure of a page. CSS controls the visual display of a page. JavaScript adds functionality to a page. A checkout screen could adjust a shipping estimate based on delivery type, show additional fields if delivery type is changed or alert the user if they did not fill out necessary fields.

This added functionality can enhance the experience of the end-user, however, it is not a trusted source regarding the transaction. The server must validate the order and enforce any applicable rules. A request can arrive without passing through the page you designed.

Prior to developing an interactive feature, consider all possible views that the user will encounter during that process. Consider loading, empty results, success and failure as possible states of view. Additionally, determine how your system will behave if a repeat request occurs. Determining these items will provide a more productive conversation than determining that all screens must utilize a large front-end development framework.

What the server does

The server receives requests and coordinates work that must be controlled centrally. An order system may verify the identity of the requesting party, check available inventory levels, store the order information and coordinate notification for confirmation. Rails can provide a structured format for creating this type of application.

A server-side JavaScript application can also complete these tasks; however, you must evaluate the combination of selected libraries and framework(s) as a whole solution. The fact that both the browser and server can use JavaScript as their primary language does not automatically establish trustworthiness of data or similarity in responsibility.

Example: displaying an estimated price and receiving a confirmed payment are two separate functions. Define where sharing makes sense, but retain ultimate authority over pricing and permission decisions on the server. Ensure your error messaging clearly communicates what action the user should take next.

Rails and JavaScript can work together

While there are certainly applications that would benefit from being able to render a full-page server-side with minimal JavaScript usage, there is nothing preventing you from starting with a Rails application and adding more richly interactive elements wherever appropriate to a workflow. The official Rails JavaScript guide offers insight into various ways to load and manage JavaScript in Rails.

Suppose you created an internal tool for employees who needed to browse purchase orders. Employees primarily opened a record, made a determination and left comments. First, ensure this process is clearly documented and reliable, then address areas where workflows seem slow. Creating a separate frontend application is just one option to explore versus automatically assuming this is the right course of action.

If employees need to reorganize multiple orders, compare scenarios or save multiple draft versions of an order, the interface now requires more localized behavior management. There may be justification for more complex frontend organization at that point. Be sure to tie your choice back to those requirements so an intended enhancement does not morph into an unintended overhaul.

Compare complete stacks through one feature

Identify a feature that has sufficient specificity to illustrate differences in technology implementations. A great example is a purchase approval workflow: a purchaser submits an item, a manager approves/rejects it, and the purchaser observes the outcome. Include an unauthorized user and an invalid submission.

Implement the same functional area within both Rails and your proposed JavaScript backend stack. Document which dependencies you chose to incorporate into your application, where validations exist, and how you tested authorization. The Rails getting started tutorial can serve as a basis for creating your initial Rails prototype; however, you should document your company-specific rules in both prototypes.

Next, modify your requirements. Request that an additional approval be required for purchases above a certain dollar threshold. Determine whether implementing this rule preserves readability in your codebase and whether your automated testing illustrates expected behavior in this scenario. Implementing a prototype that always produces a static response will not allow you to demonstrate this type of maintenance challenges.

Does one language across the stack help?

It can help: familiar syntax and tooling may reduce some context switching. A team that has confidence using JavaScript may prefer using it as their backend language as well due to familiarity with its syntax and shared tooling. Familiarity with existing libraries and experience maintaining/operating your backend may further strengthen this argument.

Regardless, browsers present unique constraints that are fundamentally different from those presented by servers. Browsers deal with user interactions, device variability and rendering issues whereas servers deal with protecting sensitive data and concurrently processing requests.

Learning one language does not eliminate the need for understanding those layers individually.

Similarly, using Ruby as your backend language is not inherently burdensome. A Rails team likely already has established conventions for changes, testing and deployment.

Compare actual handoff between developers rather than solely evaluating total number of languages involved.

Async work and background jobs need clear meaning

Support for async operations alone does not provide your product with a robust background job system. Efficiently waiting for an outside response and ensuring that a task ultimately succeeds are distinct considerations for your overall architecture.

An approval email is an example of this distinction. Should the approval process fail because the external mail service is currently offline? Or should we wait until it becomes available again? What prevents us from sending two emails as part of subsequent retries?

Determine how you want your system to behave before identifying how you intend to implement that behavior.

Regardless of whether you choose a Rails or Node.js application, track whether your job was successfully executed and provide sufficient feedback so that potential errors can be investigated.

Avoid providing positive acknowledgement messages to users indicating that work was performed when in reality you only scheduled it.

Your UI should represent the state of data that your system can prove occurred.

Performance claims need a defined workload

There is no single useful performance score for Ruby on Rails vs JavaScript. A Rails or Node.js application may spend most of its time waiting for a database or an external service. Another workload may spend substantial time doing calculations.

Measure only aspects relevant to users’ experiences.

Utilize comparable data and infrastructure.

Track response times, failure rates, and test conditions.

Determine whether poor page-load performance is related to excessive queries, returning too much data or costly browser computations.

Improving the incorrect layer will simply produce effort without benefiting anybody else.

Include the cost of understanding and acting on the results.

If only one member of your team understands how to debug failures resulting from your chosen stack, that represents operational overhead. A maintainable system requires teams capable of investigating it – not merely a promising result from limited benchmarks.

A sensible learning route

If your current objective is completing UI-related work, begin with learning about HTML/CSS/JavaScript basics. Complete building an effective form entry field, handle input values and create informative error messaging.

Add front-end libraries once you understand what problem they solve.

If you wish to construct an entire Ruby web application, learn sufficient Ruby to read typical methods/data structures and then follow along with small Rails projects. We provide short coding-examples using Ruby that precede any framework conventions.

Follow your actual job/project stack when planning an implementation or design decision.

Once comfortable with your chosen stack(s), you can always learn additional frameworks at a later date from a position of strength.

Completing one small application and documenting its request sequence is far preferable than accumulating knowledge about several partially understood frameworks.

Frequently asked questions

Can JavaScript replace Rails?

A complete server-side JavaScript stack can provide an alternative backend. JavaScript as a language does not specify all the pieces Rails supplies. Name the runtime, framework and data tools before comparing them.

Do I need React with Rails?

No. React is one option for building interfaces. Rails applications can use ordinary pages and other JavaScript approaches. Choose React when its component and state model fits the interaction you need.

Which should I choose for a new product?

Start with team experience, required dependencies and a small complete feature. Compare the actual backend stacks and decide how much frontend structure the interface needs. Keep those decisions separate enough that you can explain each one.